METHOD OF MANUFACTURE OF COMPOSITE LARGE-SIZED BLADES Russian patent published in 2003 - IPC

FIELD: aeronautical engineering; methods of manufacture of propeller blades from composite materials with carbon-filled filler for helicopters, wind-driven electric plants and cooling tower blades of circulating water systems. SUBSTANCE: proposed method includes placing blades in mold for polymerization. When blade stacks are placed in mold, evacuation bags are laid in blade passages. After closing of wooden clamps, excessive pressure is delivered to molding chambers. Polymerization of blade is performed under action of excessive pressure of 0.5 kgf/sq cm and pressure of autoclave both inside passage due to tightness of molding chambers and outside due to excessive pressure in autoclave cavity. Vacuum is formed in blade body by means of evacuation bags. Polymerization is performed in vacuum. EFFECT: low cost of process; improved quality of blades. 3 dwg